Evonik Degussa Gmbh

Evonik Operations Gmbh

Felix Nissen

Manfred Neumann

Phillip R James

Stefanie Rinker

Oliver Erpeldinger

Bettina Ludwig

Peter Watkins

Benjamin Willy

Andrew Timothy Boam

Frank Kraushaar

Katharina Minke

Guenter Kreilkamp

Jochen Niemeyer

Felix Gärtner

Velichka Yordanova Koleva

Yuri Bouwhuis

Sabine Schering

Bettina Bressel

The present invention relates to production processes for reactive monomer species. The method described herein may be used in a variety of reactive monomer production processes to optimize the use of polymerization inhibitor compounds, which may lead to further advantages such as debottlenecking or elimination of process plant separation unit(s). The method provides for the separation of oligomeric/polymeric species, inhibitor compounds and reactive monomer, optionally in the presence of unreacted raw materials or solvent(s), within the production process by means of membrane filtration, particularly through the use of solvent stable membranes, and in particular by applying organic solvent nanofiltration membranes.

Method for improved reactive monomer production with membrane filtration

An N-methyl-substituted triacetonamine compound can be produced by reacting at least one triacetonamine compound with formaldehyde under reductive conditions.

Process for preparing an N-methyl-substituted triacetonamine compound

A process for inhibiting the polymerization of cyclopentadiene compounds (B) by contacting the cyclopentadiene compound with a quinone methide compound (A) of structure (I),  Compositions (AB) comprising (A) and (B) are also provided.

Process and composition for inhibiting the polymerization of cyclopentadiene compounds

A process for inhibiting the polymerization of cyclopentadiene compounds (B) by contacting the cyclopentadiene compound with a quinone methide compound (A) of structure (I), Compositions (AB) comprising (A) and (B) are also provided.

An N-methyl-substituted triacetonamine compound is prepared by reacting at least one triacetonamine compound (I) with formaldehyde under reductive conditions, in the presence of hydrogen and in the presence of a supported catalyst, wherein the supported catalyst contains at least one metal M, wherein the metal M is selected from the group consisting of V, Cr, Mo, Mn, Ni, Pd, Pt, Fe, Ru, Os, Co, Rh, Ir, and Cu.

Growing community of inventors

Nottuln, Germany

Felix Nissen